 | In[19]:=
f = Expand[(x^2 - x + 2)^4]
Out[19]=
16 - 32*x + 56*x^2 - 56*x^3 + 49*x^4 -
28*x^5 + 14*x^6 - 4*x^7 + x^8
In[20]:=
Coefficient[f, x^7]
Out[20]=-4<-----こたえ
In[21]:=
Coefficient[f, x^5]
Out[21]=-28<-----コタエ
----------------------------------------------
In[23]:=
Expand[(A + B + C)^4]
Out[23]=
A^4 + 4*A^3*B + 6*A^2*B^2 + 4*A*B^3 + B^4 +
4*A^3*C + 12*A^2*B*C + 12*A*B^2*C +
4*B^3*C + 6*A^2*C^2 + 12*A*B*C^2 +
6*B^2*C^2 + 4*A*C^3 + 4*B*C^3 + C^4
In[24]:=
% /. {A -> x^2, B -> -x, C -> 2}
Out[24]=
16 - 32*x + 56*x^2 - 56*x^3 + 49*x^4 -
28*x^5 + 14*x^6 - 4*x^7 + x^8
|
